JPS62254036A - Material testing apparatus - Google Patents

Abstract

PURPOSE:To simplify a load mechanism and to prevent the generation of backlash, by constituting a loading actuator of a combination of a direct drive motor and a ball screw. CONSTITUTION:In a material testing apparatus 1, an actuator is constituted of a direct drive motor 7, a screw rod 12 having a ball screw cut therein and a ball screw nut 13. When a motor 7 is operated by a motor driver 17, the nut 13 attached to a rotor rotates along with the rotor and the screw rod 12 threaded with the nut 3 moves up and down corresponding to the rotary direction of the nut 13. At this time, the screw rod 12 does not rotate by a screw rod rotation stopper 15 and moves only in the up-and-down direction and testing load is directly applied to a test piece 11. By this method, a structure is simplified and backlash can be made hard to generate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a material testing device that applies a load to a test piece using an actuator.

[Prior Art] A material testing device is widely used in which a load is applied to a test piece by removing a crosshead from a screw rod provided on a table and moving the crosshead.

[Problems to be Solved by the Invention] The above-mentioned conventional test device moves the crosshead via a nut screwed onto the screw by rotating the screw with a motor. This required a complex power transmission mechanism that decelerated the rotational motion of the motor with a screwdriver and then converted it into linear motion with a screwdriver. In addition, backlash occurs in the screws and gears in the drive system, causing the load to temporarily stop as shown in Figure 4 (a) and (b).
There was a problem in that it was not possible to accurately perform tension/compression bioscillatory tests and high-speed response repeated tests.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a material testing device that can simplify the drive section of the load @ structure, perform accurate and high-speed response tests, and improve drive efficiency.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

In addition, the material testing device according to the present invention has a table mounting plate, a crosshead attached to a support, a table holder [1, and a separate head for holding the test head]. Nokuji: Shrine 11 where a load can be applied to a test piece with a tI-ta
There is a test device C, which uses Dairef 1 Hetra ~ Eve Sat-Yu as the 7 Kubuko 1-4-tater, and converts its rotational force into linear motion (this conversion It is characterized by being configured so that the output is covered by the output.

[Function] Since the load actuator is constructed by the combination of direct dry goose and hole screw, the load mechanism is simplified and bεJ backlash],
does not occur.

[Example] Fig. 1 shows an example of the material testing device according to the present invention. ) 7 was installed, and it turned out to be raa~
Pull 2 to t, 1. A crosshead 5 is provided which is supported at a predetermined height by a pair of pillars 3 and the pillars. The crosshead 55 has Lll-Docell 6.
``(The upper grip 8 is attached.D
As shown in Figure 2, the D-tough is
, [Coater 22, load receiver 23 to slab 1, rotor 24
It consists of A through hole 26 is bored in the core of the rotor 24.
A threaded rod 12 with a ball screw is loosely fitted into this through hole 26. This threaded rod 12 is connected to the rotor 2
It is screwed into the Boboru screw nut 1 attached to the end of the screw 12. At the upper end of the screw stud 12 there is a lower part 411, a double grip 8. 9th -
(Test j) 11 is retained. Also, a detent 15 is provided at the lower end of the screw stud 12 to restrict rotation of the screw rod. For this reason, the screw barrel 12 can be moved up and down or rotated (rotated).

Above [1-docell 6 (via quantum measurement system 16 (・
In addition, the DDE-Tough is electrically connected to the motor driver, driver 17, and displacement measurement system 18 via the T-]]t and the driver 2, respectively.

When the DO module 7 is actuated by the driver 17, the ball screw nut 13 with four digits attached to the date 24 rotates together with the rotor 24, and the threaded rod 12 screwed into the hole screw nut 13 moves in the direction of rotation of the nut. Accordingly, the threaded rod 12 moves in the 10" direction. At this time, the threaded rod 12 is not rotated by the detent 15 and moves only in the vertical direction. The linear movement of the threaded rod 12 in the vertical direction is controlled by the lower grip 9 connected thereto. The test load is directly applied to the test piece 11.The displacement of the test piece due to the load is measured by the displacement measurement system 18 based on the position detection signal from the rotation detector of the DD motor, and the test load is transferred to the load cell. It is measured by the load section side system 16 based on the load signal from 6.

As described above, in this material testing device 1, the actuator is composed of the DD momo-7, the threaded rod 12 with a ball screw cut, and the nut, and the load is directly applied to the test material. It is simple and reliable, and the drive efficiency of the load mechanism is high, resulting in low power consumption. In addition, since it is an electric device that does not use hydraulic oil like a hydraulic motor, installation and maintenance are easy. Since the ball screw does not easily cause backlash, it has a high-speed response during operation, and can perform, for example, a tension-compression dual system test (cycle test) accurately and smoothly as shown in FIG.

By the way, in the illustrated example, there is an actuator X2 on the table side. Although an I-ta is provided, it may be provided on the crosshead side depending on the case.

Although the above embodiments have been described with respect to a vertical testing machine, they can also be applied to a horizontal testing machine.

[Effects of the Invention] As is clear from the above description, the material testing device according to the present invention does not use oil or screws, so the loading mechanism can be easily constructed, and the transmission loss of the test load is small. This resulted in high load efficiency. In addition, since there is no backlash, it is suitable for fast-response retention tests, such as 8 consecutive tension-compression double-wall tests that can be conducted smoothly and accurately.

[Brief explanation of drawings]

Fig. 1 shows one embodiment of the present invention.
The figure is an explanatory diagram showing the configuration of a direct drive, and Fig. 3 is a tension-compression image of the example device (V of the dragon test).
Figures 4(a) and 9(b) showing changes in J9 are diagrams showing changes in load in a tension-compression bioscillatory test using rice-filled stomachs. 1...Material testing equipment 2...Table 5...Cross head 7...Die reflex]/Drive motor (Dl) motor)
8.9...Gripper 12...Screw head 13...
Pole screw nut [・ 15... Threaded rod rotation stopper

Claims (1)

[Claims] (1) Attach the crosshead to the support provided on the table,
A material testing device that holds a test piece between a table and a crosshead and applies a load to the test piece using a separately provided actuator, and uses a direct drive motor as the actuator, and uses the rotational force of a ball screw to cut the test piece. A material testing device characterized in that it is configured to convert linear motion into linear motion and output it by a combination of a threaded rod and a nut.